I am going to build a hardtail 29er. I am an older guy who rides non-technical single track and jeep trails. I was thinking about springing for a Cane Creek suspension seatpost. Are any of you using a suspension seatpost, and if so what are your thoughts?

I've mentioned this a couple of times. I found a Sartori Harmony, very reasonable price. I'm an old guy, ride a variety of surfaces, paved, unpaved and gravel. It takes the sting out the bumps and potholes. Worth a look. I have one on both my bikes, a gravel bike and a Trek DS.

I put a SR Suntour SP12 NCX on my hardtail and I wouldn't be without it. As far as changing the geometry of the bike it hardly negotiable, but it sure takes some shock out of the holes.
Check them out at the Suntour site.

I am going to build a hardtail 29er. I am an older guy who rides non-technical single track and jeep trails. I was thinking about springing for a Cane Creek suspension seatpost. Are any of you using a suspension seatpost, and if so what are your thoughts?

I have owned 2 thudbuster posts the long travel and now short travel
They are excellent love the ST version using it now on my Gary Fisher HT

I have an ancient Rockshox with a rubber insert on my hardtail, and a newer (cheaper) Nashbar on my hybrid. I think they worked/work...therefore, they did/do. I just purchased a full suspension MTB (a significant upgrade in cushiness over the hardtail) and have a Domane road bike...anything to protect my +60yo back.